Internet explorer will not allow to go to secure settings

I switched from verizon to roadrunner and the person that installed failed to leave any info. system will let me go to a general site; ie my bank home page, but will not let me log in .... give s a this page cannot be displayed. i cannot get any updates...a fix error program gave me the message "boot critical file c:\ntoskrnl.exe is corrupt. it will not let us log onto any of our emails from this system

i am a plug and play type and i have not a clue what this means. my gateway desktop is approx. 1 yr old

thanks for ay help
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